5. Close OXYGEN SUPPLY valve V-6. Bleedthe test stand using SYSTEM BLEED valve V-5.Close TEST PRESSURE GAUGE-TO-BELLJAR valve V-2.6. Remove the converter assembly from teststand.FILL AND BUILDUP TIME TESTTo perform the fill and buildup time test, itwill be necessary to take the converter to a LOXservicing area, or use a LOX servicing trailer inthe immediate area of the oxygen shop. Any othermethod is acceptable that meets requirements ofthe test, and does not violate safety precautions.Remember, LOX requires special precautions.Once the converter is in a satisfactory loca-tion, proceed as follows:1. Attach a vent drain line to the converterquick-disconnect coupling. This line should belong enough to route venting LOX away from allpersonnel.2. Attach the pressure gauge/relief valve testfixtures to the supply quick-disconnect coupling(refer to NAVAIR 13-1-6.4).3. Attach the servicing trailer filler valve tothe converter fill, buildup, and vent valve.4. Note the time, and start filling theconverter. Maintain a filling pressure at 30 psig.5. The converter is full when a steady streamof LOX flows from the drain line. When theconverter is full, note the time. The time requiredto fill the converter at 30 psig should be no longerthan 10 minutes. Record the fill time in theappropriate space on the Performance Test Sheet.6. Note the time, and disconnect and securethe servicing trailer. The time noted at this pointis the beginning of the buildup time test.7. Observe the pressure gauge on the quick-disconnect coupling. On the performance testsheet, record the time it takes the converterassembly to buildup to a working pressure of 70to 80 psig. This time should not exceed 5 minutes.8. If discrepancies were noted in either partof the test, locate the probable cause using thetroubleshooting chart (table 12-21).9. Remove the vent drain line and the pressuregauge/relief valve test fixture you installed in steps1 and 2.CAPACITANCE TEST (FULL)The capacitance test requires simultaneous useof the 50-pound scales and the quantity gaugecapacitance type tester incorporated in the teststand. Ensure the scales are positioned closeenough to the tester, then proceed as follows:1. Place the full converter on the scales.2. Using the test stand cable assembly,connect the upper terminals of the converter highand low capacitance cable assemblies to terminalsA and B, respectively, of the liquid oxygenquantity gauge capacitance type tester.3. Turn the power ON and allow the testerto warm up 10 minutes before proceeding.4. Turn the CAPACITANCE RANGESELECTOR knob to its 10X position.5. Turn the FUNCTION SELECTOR knobto the CAPACITANCE (UUF) position.6. Enter the total weight of the full converterin the space provided on the performance testsheet.7. Subtract the tare weight of the converterfrom its total weight. Enter this figure on thePerformance Test Sheet. This is the weight ofLOX in the converter.8. Using the formula given on the Perform-ance Test Sheet, 2.33 x W + 124.7 = C(max),calculate the capacitance maximum (C-max). Usethe weight of LOX for W. Enter the result of thecalculation in the space provided.9. Use the formula 2.25 x W + 122.3= C(min) and calculate the capacitance minimum(C-tin) on the next line of the test sheet. Use theweight of LOX for W.Table 12-21.Troubleshooting (Fill and Buildup Time Test)12-30